/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.uibuilder.api;

public interface ScrollHandler {
  /**
   * Sets the scroll position to scrollAmount pixels.*
   *
   * @return the change (in number of pixels) in the scroll position
   */
  int update(int scrollAmount);

  /**
   * Finishes a scroll of scrollAmount pixels.
   */
  void commit(int scrollAmount);

  /**
   * Returns whether a scroll of scrollAmount pixels is possible.
   */
  boolean canScroll(int scrollAmount);
}
